The Terminator occurs when you are having sexual intercourse with a woman, and just when you think she is going to have an orgasm, you pull out, stand up, and say "Ill be back"..You better run fast though, because she will be pissed.

After John Cameron was mysteriously sent 47 years into the future to the year 2029 and back again in 1982 he suffered from numerous nightmares and headaches. Feeling that the only way to put his body at ease was to share his experience with the world and he wrote "The Terminator."
Knowing this would happen, SkyNet sent a large muscle bound cyborg back in time to 1982 in order to assassinate John Cameron before he would expose the future to the world through his upcoming film.
Due to strange happenings, the assassin cyborg became the lead star in Cameron's movie.